Theorem nrexdv 2643

Description: Deduction adding restricted existential quantifier to negated wff. (Contributed by NM, 16-Oct-2003.)

Hypothesis

Ref	Expression
nrexdv.1	|- ( ( ph /\ x e. A ) -> -. ps )

Assertion

Ref	Expression
nrexdv	|- ( ph -> -. E. x e. A ps )

Distinct variable group:   ph, x

Allowed substitution hints:   ps( x)   A( x)

Proof of Theorem nrexdv

Step	Hyp	Ref	Expression
1		nrexdv.1	. . 3 |- ( ( ph /\ x e. A ) -> -. ps )
2	1	ralrimiva 2623	. 2 |- ( ph -> A. x e. A -. ps )
3		ralnex 2538	. 2 |- ( A. x e. A -. ps <-> -. E. x e. A ps )
4	2, 3	sylib 122	1 |- ( ph -> -. E. x e. A ps )

This proof depends on syntax axioms:   -. wn 3   -> wi 4   /\ wa 104   e. wcel 2209   A.wral 2528   E.wrex 2529

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 623  ax-in2 624  ax-5 1500  ax-gen 1502  ax-ie2 1547  ax-4 1563  ax-17 1579

This proof depends on definitions:  df-bi 117  df-tru 1405  df-fal 1408  df-nf 1514  df-ral 2533  df-rex 2534

This theorem is used by:  ltpopr  7962  cauappcvgprlemladdru  8023  cauappcvgprlemladdrl  8024  caucvgprlemladdrl  8045  caucvgprprlemaddq  8075  dvdsle  12611  ballotfilemimin  13249